Week 5 and Janet Devlin sings "I Want You Back" by Jackson 5:
Added 05/11/11: 
Recent comments about the above video:
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Callum 'Fergs' Ferguson:
November 14, 2011 @ 4:44pm
"Janet is the best thing to happen to X Factor since the beginning; she is so beautiful and talented, she could be the next Ellie Goulding!"